[Swift] 딕셔너리 / Dictionary

Dictionary

Generic Structure
A collection whose elements are key-value pairs.

@frozen struct Dictionary<Key, Value> where Key : Hashable

ar responseMessages = [200: "OK",
                        403: "Access forbidden",
                        404: "File not found",
                        500: "Internal server error"]


var emptyDict: [String: String] = [:]

 

print(responseMessages[200])
// Prints "Optional("OK")"

let httpResponseCodes = [200, 403, 301]
for code in httpResponseCodes {
    if let message = responseMessages[code] {
        print("Response \(code): \(message)")
    } else {
        print("Unknown response \(code)")
    }
}
// Prints "Response 200: OK"
// Prints "Response 403: Access forbidden"
// Prints "Unknown response 301"